ΛCDM model with dissipative nonextensive viscous dark matter

H.S. Gimenes, G.M. Viswanathan and R. Silva

Physica A: Statistical Mechanics and its Applications, 2018, vol. 494, issue C, 331-339

Abstract: Many models in cosmology typically assume the standard bulk viscosity. We study an alternative interpretation for the origin of the bulk viscosity. Using nonadditive statistics proposed by Tsallis, we propose a bulk viscosity component that can only exist by a nonextensive effect through the nonextensive/dissipative correspondence (NexDC). In this paper, we consider a ΛCDM model for a flat universe with a dissipative nonextensive viscous dark matter component, following the Eckart theory of bulk viscosity, without any perturbative approach. In order to analyze cosmological constraints, we use one of the most recent observations of Type Ia Supernova, baryon acoustic oscillations and cosmic microwave background data.

Keywords: Bulk viscosity; Dark matter; Non-extensivity (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:494:y:2018:i:c:p:331-339

DOI: 10.1016/j.physa.2017.12.064

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